Axle shaft ID

I got these axles many years ago, forgot what they go to. They're Mopar 4.5" bolt circle, 31 spline, 31 1/8" length from back of flange and are made for retaining clip. Anyone know if they're Dana 60 or 9 1/4" rear or whatever? Only number stamped in them is A1003. Thanx.

I don't know for positive but I think those are Ford axles... They used the 4.5 spacing and those are C clip axles and I don't know if Mopar ever had 31 spline axles but Ford did..

Again I'm no expert but I've done a lot of looking lately since I just broke an axle last week...

Agree, look like ford axles to me, 31 spline tells the tale !

could be 9 1/4 as, i think 9 1/4 also had 31 spline axle count. the reason that i say that is cause i looked at trying to find a 31 spline ford unit to see if the axles from 9 1/4 would fit so i could narrow a 9 1/4 housing and use ford axles.

Both the Ford and 9 1/4" are 31-spline but the Ford has a 90° spline angle and, I believe, the Mopar is 60°....might also be a different diameter.

thank you john. i have tried to find that info as to the difference. i now know. also my dad has asked you before and i think you said no politely, hahahaha, but please write a book on the trans stuff you used to have and all the other knowledge you have. it would be flying off the shelf, especially all the trans info you posses. PLEASE DO IT. trw1982

Does the 9 1/4 use C clips? Those look like C clip axles.... Never had a 9 1/4 so I have no clue there...

Yes, 9-1/4 axles use C-Clips to hold them in.

Don't Ford & Mopar have a different size center hole for the brake drums. If they do, anyone know the different measurements?

A quick online search came up with

from a few years of junkyard ownership [1872-1986] the ford axle register was 2.740-745 while the wheel center hole is 2.750 -2.765.
the chrysler hub register is 2.800-2.805, the wheel hole is 2.810-2.825.
i have measured these things countless times over the years, and these numbers are for bare, non rusted components. even surface rust will give different results, so measure carefully. rusty stuff will go together, but be a somewhat of a "beach" getting apart. kind of like beating on a tire/wheel assembly or a rear brake drum. we all know the drill for these.
hope this helps.

Good Info . Thank you Bob . ronnie

Just measured, 2 13/16". Must be for Mopar 9 1/4" rear. Thanks for all the help.

2 13/16 = 2.8125, so well into tolerance. you are good to go.